package com.sky.aspect;

import com.sky.anotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * @author Zhang Maojie
 * @date 2024/3/19 15:07
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.anotation.AutoFill)")
    public void autoFillPoinCut() {}

    //前置通知
    @Before("autoFillPoinCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        log.info("公共字段自动填充...");
        //获取当前方法数据库操作类型
        MethodSignature signature = (MethodSignature)joinPoint.getSignature(); //方法签名的对象
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType value = annotation.value(); //获得数据库操作类型
        //获取当前方法参数实体
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0) {
            return;
        }
        Object entity = args[0]; //默认第一个参数是实体类
        //准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //采用反射进行赋值
        if(value == OperationType.INSERT) {
            Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            setCreateTime.invoke(entity, now);
            setCreateUser.invoke(entity, currentId);
            setUpdateTime.invoke(entity, now);
            setUpdateUser.invoke(entity, currentId);
        }else if(value == OperationType.UPDATE) {
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            setUpdateTime.invoke(entity, now);
            setUpdateUser.invoke(entity, currentId);
        }
    }
}
